(e) P415 Main Power Distribution Panel
1) 415B27 ALTN TEMP CONT ZN A
2) 415B28 ALTN TEMP CONT PWR R
3) 415E32 ACM MASS FLOW IND
S 866-100
(7) For the applicable engine: Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) 6F01 ENG 1 IGN 1
2) 6F02 ENG 2 IGN 1
3) 6F03 ENG 3 IGN 1
4) 6F04 ENG 4 IGN 1
5) 6G19 STBY IGN ENG 1
6) 6G20 STBY IGN ENG 2
7) 6G21 STBY IGN ENG 3
8) 6G22 STBY IGN ENG 4
9) 6J18 ENG START AIR CONT
10) 6K19 ENG 1 IGN 2
11) 6K20 ENG 2 IGN 2
12) 6K21 ENG 3 IGN 2
13) 6K22 ENG 4 IGN 2
14) 6L10 ENG 1 FUEL CONT VLV
15) 6L11 ENG 2 FUEL CONT VLV
16) 6L12 ENG 3 FUEL CONT VLV
17) 6L13 ENG 4 FUEL CONT VLV
S 866-101
(8) For the applicable engine, Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7J01 HYD DEMAND 1
2) 7G01 HYD DEMAND 2
3) 7H01 HYD DEMAND 3
4) 7F01 HYD DEMAND 4
S 866-102
(9) Put these switches on the P5 overhead panel in the OFF position:
(a) AFT CARGO HT
(b) WING ANTI-ICE
S 866-103
(10) Put these switches on the P5 overhead panel in the open position:
(a) L ISLN
(b) R ISLN
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747-400 MAINTENANCE MANUAL
S 866-149
WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP
CONTROL LEVER. WITH THE HYDRAULIC POWER REMOVED, THE FLAPS
WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE
FLAP CONTROL LEVER.
(11)
Extend the leading edge flaps to the 5 position with the alternate extension/retraction system (AMM 27-81-00/201).
S 866-106
(12)
Put the flap control handle in the 5 position.
S 486-107
(13)
Install a caution tag on the ALTN FLAPS ARM switch: "Caution - Do not put this switch in the off position".
S 486-108
(14)
Install the caution tags on the Flap Drive Alternate Control switch and the Flap Control handle: "Caution - Do not move from the flaps 5 position".
S 866-109
(15)
Put the four ENGINE BLEED switches on the P5 overhead panel in the off position.
S 496-110
(16)
Connect the air source to one of the ground service pneumatic connections.
S 866-111
(17)
Pressurize the pneumatic system to 44-46 psig (AMM 36-00-00/201).
S 796-112
(18)
Examine all of the ducts and couplings in these areas for condition and leakage.
NOTE: A small quantity of leakage is permitted from the
____ joints. There must not be a high concentration of leakage from the joints. A high concentration of airflow can be felt by the hand from a distance of 12 inches from the leakage source.
(a)
Strut ducts downstream of the engine bleed air PRSOV
(b)
Wing leading edge ducts
(c)
Crossover manifold upstream of the air-conditioning pack flow control and shutoff valves (pack valves)
(d)
Crossover manifold downstream of the pack valves up to the APU check valve.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
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